Omron V690 Series User Manual page 50

Internal configuration of the 1:N connection of an antenna and host device through RS-485 (2-wire) is shown below.
• Signal lines (Rx, Tx and SG) of RS-232C are disconnected.
• If RS-485 is selected with the link unit, the terminating resistance (220 Ω) can be turned ON/OFF.
Microwave
antenna
Station No. 00
RS-422A/485 link
unit connecting
cable
Link unit
Antenna
power
supply
switch
Antenna
Power sup- Setting
ply circuit mode
Setting switch
RS-422A circuit
RS-232C circuit
Cut in a connector.
4-2 How to Wire to Host Device
Link unit
When switching
RS-485
4-15